$(document).ready(function () {
    $(".rupiah-format").on("keyup", function (e) {
        $(this).val(formatRupiah($(this).val(), "Rp"));
    });

    function formatRupiah(number, prefix) {
        var numberString = number.replace(/[^,\d]/g, "").toString(),
            split = numberString.split(","),
            remainder = split[0].length % 3,
            rupiah = split[0].substr(0, remainder),
            thousands = split[0].substr(remainder).match(/\d{3}/gi);

        if (thousands) {
            separator = remainder ? "." : "";
            rupiah += separator + thousands.join(".");
        }

        if (split[1] != undefined) {
            rupiah = rupiah + "," + split[1].substr(0, 2);
        }

        return prefix == undefined ? rupiah : rupiah ? prefix + rupiah : "";
    }
});